Novel morphological and molecular data for Corynosoma hannae Zdzitowiecki, 1984 (Acanthocephala: Polymorphidae) from teleosts, fish-eating birds and pinnipeds from New Zealand

Hernández‐Orts, Jesús S.; Smales, Lesley R.; Pinacho-Pinacho, Carlos Daniel; García-Varela, Martìn; Presswell, Bronwen

doi:10.1016/j.parint.2016.10.007

Cited by 23 publications

(22 citation statements)

References 32 publications

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“…Corynosoma species relationships yielded from the cox 1 dataset ( Fig 5B ) were highly concordant with those of Hernández-Orts et al [ 39 ], although with poor support for most of the nodes. The newly sequenced isolates clustered together with an isolate for C .…”

Section: Resultssupporting

confidence: 80%

“…This result further confirms the distinct species status of the isolate of García-Varela et al [ 54 ] from P . hookeri , as recently indicated by Hernández-Orts et al [ 39 ], and assigned to C . hannae based on the cox 1 sequence data.…”

Section: Resultssupporting

confidence: 60%

“…The newly sequenced isolates clustered together with an isolate for C . australe of Hernández-Orts et al [ 39 ] from O . flavescens off Patagonia in a strongly supported clade sister to the C .…”

Section: Resultsmentioning

confidence: 99%

“…[ 18 ]), and several species are diagnosed using subtle differences in the number and arrangement of proboscis hooks, body armature, and morphometry (e.g. [ 34 , 37 – 39 ]). However, the extent to which these subtle differences may represent instances of intraspecific variation is an open question.…”

Section: Introductionmentioning

confidence: 99%

“…[ 40 ]). Thus, ideally, morphological and molecular data should be combined to facilitate the diagnosis of taxa (see, [ 39 , 41 ]).…”

Section: Introductionmentioning

confidence: 99%

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From mammals back to birds: Host-switch of the acanthocephalan Corynosoma australe from pinnipeds to the Magellanic penguin Spheniscus magellanicus

et al. 2017

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Trophically-transmitted parasites are regularly exposed to potential new hosts through food web interactions. Successful colonization, or switching, to novel hosts, occur readily when ‘donor’ and ‘target’ hosts are phylogenetically related, whereas switching between distantly related hosts is rare and may result from stochastic factors (i.e. rare favourable mutations). This study investigates a host-switching event between a marine acanthocephalan specific to pinnipeds that is apparently able to reproduce in Magellanic penguins Spheniscus magellanicus from Brazil. Detailed analysis of morphological and morphometrical data from acanthocephalans from penguins indicates that they belong to Corynosoma australe Johnston, 1937. Partial fragments of the 28S rRNA and mitochondrial cox1 genes were amplified from isolates from penguins and two pinniped species (i.e. South American sea lion Otaria flavescens and South American fur seal Arctocephalus australis) to confirm this identification. Infection parameters clearly differ between penguins and the two pinniped species, which were significantly lower in S. magellanicus. The sex ratio of C. australe also differed between penguins and pinnipeds; in S. magellanicus was strongly biased against males, while in pinnipeds it was close to 1:1. Females of C. australe from O. flavescens were smaller than those from S. magellanicus and A. australis. However, fecundity (i.e. the proportion of fully developed eggs) was lower and more variable in females collected from S. magellanicus. At first glance, the occurrence of reproductive individuals of C. australe in Magellanic penguins could be interpreted as an adaptive colonization of a novel avian host through favourable mutations. However, it could also be considered, perhaps more likely, as an example of ecological fitting through the use of a plesimorphic (host) resource, since the ancestors of Corynosoma infected aquatic birds.

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Section: Resultssupporting

confidence: 80%

Section: Resultssupporting

confidence: 60%

Section: Resultsmentioning

confidence: 99%